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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2011 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except<a name="line.4"></a>
<span class="sourceLineNo">005</span> * in compliance with the License. You may obtain a copy of the License at<a name="line.5"></a>
<span class="sourceLineNo">006</span> *<a name="line.6"></a>
<span class="sourceLineNo">007</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.7"></a>
<span class="sourceLineNo">008</span> *<a name="line.8"></a>
<span class="sourceLineNo">009</span> * Unless required by applicable law or agreed to in writing, software distributed under the License<a name="line.9"></a>
<span class="sourceLineNo">010</span> * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express<a name="line.10"></a>
<span class="sourceLineNo">011</span> * or implied. See the License for the specific language governing permissions and limitations under<a name="line.11"></a>
<span class="sourceLineNo">012</span> * the License.<a name="line.12"></a>
<span class="sourceLineNo">013</span> */<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span>package com.google.common.hash;<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>import static com.google.common.base.Preconditions.checkArgument;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import com.google.common.annotations.Beta;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import com.google.common.primitives.UnsignedInts;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.io.Serializable;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>/**<a name="line.25"></a>
<span class="sourceLineNo">026</span> * Static factories for creating {@link HashCode} instances; most users should never have to use<a name="line.26"></a>
<span class="sourceLineNo">027</span> * this. All returned instances are {@link Serializable}.<a name="line.27"></a>
<span class="sourceLineNo">028</span> *<a name="line.28"></a>
<span class="sourceLineNo">029</span> * @author Dimitris Andreou<a name="line.29"></a>
<span class="sourceLineNo">030</span> * @since 12.0<a name="line.30"></a>
<span class="sourceLineNo">031</span> */<a name="line.31"></a>
<span class="sourceLineNo">032</span>@Beta<a name="line.32"></a>
<span class="sourceLineNo">033</span>public final class HashCodes {<a name="line.33"></a>
<span class="sourceLineNo">034</span>  private HashCodes() {}<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span>  /**<a name="line.36"></a>
<span class="sourceLineNo">037</span>   * Creates a 32-bit {@code HashCode}, of which the bytes will form the passed int, interpreted <a name="line.37"></a>
<span class="sourceLineNo">038</span>   * in little endian order.<a name="line.38"></a>
<span class="sourceLineNo">039</span>   */<a name="line.39"></a>
<span class="sourceLineNo">040</span>  public static HashCode fromInt(int hash) {<a name="line.40"></a>
<span class="sourceLineNo">041</span>    return new IntHashCode(hash);<a name="line.41"></a>
<span class="sourceLineNo">042</span>  }<a name="line.42"></a>
<span class="sourceLineNo">043</span>  <a name="line.43"></a>
<span class="sourceLineNo">044</span>  private static final class IntHashCode extends HashCode implements Serializable {<a name="line.44"></a>
<span class="sourceLineNo">045</span>    final int hash;<a name="line.45"></a>
<span class="sourceLineNo">046</span>    <a name="line.46"></a>
<span class="sourceLineNo">047</span>    IntHashCode(int hash) {<a name="line.47"></a>
<span class="sourceLineNo">048</span>      this.hash = hash;<a name="line.48"></a>
<span class="sourceLineNo">049</span>    }<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span>    @Override public int bits() {<a name="line.51"></a>
<span class="sourceLineNo">052</span>      return 32;<a name="line.52"></a>
<span class="sourceLineNo">053</span>    }<a name="line.53"></a>
<span class="sourceLineNo">054</span><a name="line.54"></a>
<span class="sourceLineNo">055</span>    @Override public byte[] asBytes() {<a name="line.55"></a>
<span class="sourceLineNo">056</span>      return new byte[] {<a name="line.56"></a>
<span class="sourceLineNo">057</span>          (byte) hash,<a name="line.57"></a>
<span class="sourceLineNo">058</span>          (byte) (hash &gt;&gt; 8),<a name="line.58"></a>
<span class="sourceLineNo">059</span>          (byte) (hash &gt;&gt; 16),<a name="line.59"></a>
<span class="sourceLineNo">060</span>          (byte) (hash &gt;&gt; 24)};<a name="line.60"></a>
<span class="sourceLineNo">061</span>    }<a name="line.61"></a>
<span class="sourceLineNo">062</span>    <a name="line.62"></a>
<span class="sourceLineNo">063</span>    @Override public int asInt() {<a name="line.63"></a>
<span class="sourceLineNo">064</span>      return hash;<a name="line.64"></a>
<span class="sourceLineNo">065</span>    }<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span>    @Override public long asLong() {<a name="line.67"></a>
<span class="sourceLineNo">068</span>      throw new IllegalStateException("this HashCode only has 32 bits; cannot create a long");<a name="line.68"></a>
<span class="sourceLineNo">069</span>    }<a name="line.69"></a>
<span class="sourceLineNo">070</span><a name="line.70"></a>
<span class="sourceLineNo">071</span>    @Override<a name="line.71"></a>
<span class="sourceLineNo">072</span>    public long padToLong() {<a name="line.72"></a>
<span class="sourceLineNo">073</span>      return UnsignedInts.toLong(hash);<a name="line.73"></a>
<span class="sourceLineNo">074</span>    }<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span>    private static final long serialVersionUID = 0;<a name="line.76"></a>
<span class="sourceLineNo">077</span>  }<a name="line.77"></a>
<span class="sourceLineNo">078</span>  <a name="line.78"></a>
<span class="sourceLineNo">079</span>  /**<a name="line.79"></a>
<span class="sourceLineNo">080</span>   * Creates a 64-bit {@code HashCode}, of which the bytes will form the passed long, interpreted <a name="line.80"></a>
<span class="sourceLineNo">081</span>   * in little endian order.<a name="line.81"></a>
<span class="sourceLineNo">082</span>   */<a name="line.82"></a>
<span class="sourceLineNo">083</span>  public static HashCode fromLong(long hash) {<a name="line.83"></a>
<span class="sourceLineNo">084</span>    return new LongHashCode(hash);<a name="line.84"></a>
<span class="sourceLineNo">085</span>  }<a name="line.85"></a>
<span class="sourceLineNo">086</span>  <a name="line.86"></a>
<span class="sourceLineNo">087</span>  private static final class LongHashCode extends HashCode implements Serializable {<a name="line.87"></a>
<span class="sourceLineNo">088</span>    final long hash;<a name="line.88"></a>
<span class="sourceLineNo">089</span>    <a name="line.89"></a>
<span class="sourceLineNo">090</span>    LongHashCode(long hash) {<a name="line.90"></a>
<span class="sourceLineNo">091</span>      this.hash = hash;<a name="line.91"></a>
<span class="sourceLineNo">092</span>    }<a name="line.92"></a>
<span class="sourceLineNo">093</span><a name="line.93"></a>
<span class="sourceLineNo">094</span>    @Override public int bits() {<a name="line.94"></a>
<span class="sourceLineNo">095</span>      return 64;<a name="line.95"></a>
<span class="sourceLineNo">096</span>    }<a name="line.96"></a>
<span class="sourceLineNo">097</span><a name="line.97"></a>
<span class="sourceLineNo">098</span>    @Override public byte[] asBytes() {<a name="line.98"></a>
<span class="sourceLineNo">099</span>      return new byte[] {<a name="line.99"></a>
<span class="sourceLineNo">100</span>          (byte) hash,<a name="line.100"></a>
<span class="sourceLineNo">101</span>          (byte) (hash &gt;&gt; 8),<a name="line.101"></a>
<span class="sourceLineNo">102</span>          (byte) (hash &gt;&gt; 16),<a name="line.102"></a>
<span class="sourceLineNo">103</span>          (byte) (hash &gt;&gt; 24),<a name="line.103"></a>
<span class="sourceLineNo">104</span>          (byte) (hash &gt;&gt; 32),<a name="line.104"></a>
<span class="sourceLineNo">105</span>          (byte) (hash &gt;&gt; 40),<a name="line.105"></a>
<span class="sourceLineNo">106</span>          (byte) (hash &gt;&gt; 48),<a name="line.106"></a>
<span class="sourceLineNo">107</span>          (byte) (hash &gt;&gt; 56)};<a name="line.107"></a>
<span class="sourceLineNo">108</span>    }<a name="line.108"></a>
<span class="sourceLineNo">109</span><a name="line.109"></a>
<span class="sourceLineNo">110</span>    @Override public int asInt() {<a name="line.110"></a>
<span class="sourceLineNo">111</span>      return (int) hash;<a name="line.111"></a>
<span class="sourceLineNo">112</span>    }<a name="line.112"></a>
<span class="sourceLineNo">113</span><a name="line.113"></a>
<span class="sourceLineNo">114</span>    @Override public long asLong() {<a name="line.114"></a>
<span class="sourceLineNo">115</span>      return hash;<a name="line.115"></a>
<span class="sourceLineNo">116</span>    }<a name="line.116"></a>
<span class="sourceLineNo">117</span><a name="line.117"></a>
<span class="sourceLineNo">118</span>    @Override<a name="line.118"></a>
<span class="sourceLineNo">119</span>    public long padToLong() {<a name="line.119"></a>
<span class="sourceLineNo">120</span>      return hash;<a name="line.120"></a>
<span class="sourceLineNo">121</span>    }<a name="line.121"></a>
<span class="sourceLineNo">122</span><a name="line.122"></a>
<span class="sourceLineNo">123</span>    private static final long serialVersionUID = 0;<a name="line.123"></a>
<span class="sourceLineNo">124</span>  }<a name="line.124"></a>
<span class="sourceLineNo">125</span>  <a name="line.125"></a>
<span class="sourceLineNo">126</span>  /**<a name="line.126"></a>
<span class="sourceLineNo">127</span>   * Creates a {@code HashCode} from a byte array. The array is defensively copied to preserve<a name="line.127"></a>
<span class="sourceLineNo">128</span>   * the immutability contract of {@code HashCode}. The array must be at least of length 4.<a name="line.128"></a>
<span class="sourceLineNo">129</span>   */<a name="line.129"></a>
<span class="sourceLineNo">130</span>  public static HashCode fromBytes(byte[] bytes) {<a name="line.130"></a>
<span class="sourceLineNo">131</span>    checkArgument(bytes.length &gt;= 4, "A HashCode must contain at least 4 bytes.");<a name="line.131"></a>
<span class="sourceLineNo">132</span>    return fromBytesNoCopy(bytes.clone());<a name="line.132"></a>
<span class="sourceLineNo">133</span>  }<a name="line.133"></a>
<span class="sourceLineNo">134</span><a name="line.134"></a>
<span class="sourceLineNo">135</span>  /**<a name="line.135"></a>
<span class="sourceLineNo">136</span>   * Creates a {@code HashCode} from a byte array. The array is &lt;i&gt;not&lt;/i&gt; copied defensively, <a name="line.136"></a>
<span class="sourceLineNo">137</span>   * so it must be handed-off so as to preserve the immutability contract of {@code HashCode}.<a name="line.137"></a>
<span class="sourceLineNo">138</span>   * The array must be at least of length 4 (not checked).<a name="line.138"></a>
<span class="sourceLineNo">139</span>   */<a name="line.139"></a>
<span class="sourceLineNo">140</span>  static HashCode fromBytesNoCopy(byte[] bytes) {<a name="line.140"></a>
<span class="sourceLineNo">141</span>    return new BytesHashCode(bytes);<a name="line.141"></a>
<span class="sourceLineNo">142</span>  }<a name="line.142"></a>
<span class="sourceLineNo">143</span>  <a name="line.143"></a>
<span class="sourceLineNo">144</span>  private static final class BytesHashCode extends HashCode implements Serializable {<a name="line.144"></a>
<span class="sourceLineNo">145</span>    final byte[] bytes;<a name="line.145"></a>
<span class="sourceLineNo">146</span>    <a name="line.146"></a>
<span class="sourceLineNo">147</span>    BytesHashCode(byte[] bytes) {<a name="line.147"></a>
<span class="sourceLineNo">148</span>      this.bytes = checkNotNull(bytes);<a name="line.148"></a>
<span class="sourceLineNo">149</span>    }<a name="line.149"></a>
<span class="sourceLineNo">150</span><a name="line.150"></a>
<span class="sourceLineNo">151</span>    @Override public int bits() {<a name="line.151"></a>
<span class="sourceLineNo">152</span>      return bytes.length * 8;<a name="line.152"></a>
<span class="sourceLineNo">153</span>    }<a name="line.153"></a>
<span class="sourceLineNo">154</span><a name="line.154"></a>
<span class="sourceLineNo">155</span>    @Override public byte[] asBytes() {<a name="line.155"></a>
<span class="sourceLineNo">156</span>      return bytes.clone();<a name="line.156"></a>
<span class="sourceLineNo">157</span>    }<a name="line.157"></a>
<span class="sourceLineNo">158</span><a name="line.158"></a>
<span class="sourceLineNo">159</span>    @Override public int asInt() {<a name="line.159"></a>
<span class="sourceLineNo">160</span>      return (bytes[0] &amp; 0xFF)<a name="line.160"></a>
<span class="sourceLineNo">161</span>          | ((bytes[1] &amp; 0xFF) &lt;&lt; 8)<a name="line.161"></a>
<span class="sourceLineNo">162</span>          | ((bytes[2] &amp; 0xFF) &lt;&lt; 16)<a name="line.162"></a>
<span class="sourceLineNo">163</span>          | ((bytes[3] &amp; 0xFF) &lt;&lt; 24);<a name="line.163"></a>
<span class="sourceLineNo">164</span>    }<a name="line.164"></a>
<span class="sourceLineNo">165</span><a name="line.165"></a>
<span class="sourceLineNo">166</span>    @Override public long asLong() {<a name="line.166"></a>
<span class="sourceLineNo">167</span>      if (bytes.length &lt; 8) {<a name="line.167"></a>
<span class="sourceLineNo">168</span>        // Checking this to throw the correct type of exception<a name="line.168"></a>
<span class="sourceLineNo">169</span>        throw new IllegalStateException("Not enough bytes");<a name="line.169"></a>
<span class="sourceLineNo">170</span>      }<a name="line.170"></a>
<span class="sourceLineNo">171</span>      return (bytes[0] &amp; 0xFFL)<a name="line.171"></a>
<span class="sourceLineNo">172</span>          | ((bytes[1] &amp; 0xFFL) &lt;&lt; 8)<a name="line.172"></a>
<span class="sourceLineNo">173</span>          | ((bytes[2] &amp; 0xFFL) &lt;&lt; 16)<a name="line.173"></a>
<span class="sourceLineNo">174</span>          | ((bytes[3] &amp; 0xFFL) &lt;&lt; 24)<a name="line.174"></a>
<span class="sourceLineNo">175</span>          | ((bytes[4] &amp; 0xFFL) &lt;&lt; 32)<a name="line.175"></a>
<span class="sourceLineNo">176</span>          | ((bytes[5] &amp; 0xFFL) &lt;&lt; 40)<a name="line.176"></a>
<span class="sourceLineNo">177</span>          | ((bytes[6] &amp; 0xFFL) &lt;&lt; 48)<a name="line.177"></a>
<span class="sourceLineNo">178</span>          | ((bytes[7] &amp; 0xFFL) &lt;&lt; 56);<a name="line.178"></a>
<span class="sourceLineNo">179</span>    }<a name="line.179"></a>
<span class="sourceLineNo">180</span><a name="line.180"></a>
<span class="sourceLineNo">181</span>    @Override<a name="line.181"></a>
<span class="sourceLineNo">182</span>    public long padToLong() {<a name="line.182"></a>
<span class="sourceLineNo">183</span>      return (bytes.length &lt; 8) ? UnsignedInts.toLong(asInt()) : asLong();<a name="line.183"></a>
<span class="sourceLineNo">184</span>    }<a name="line.184"></a>
<span class="sourceLineNo">185</span><a name="line.185"></a>
<span class="sourceLineNo">186</span>    private static final long serialVersionUID = 0;<a name="line.186"></a>
<span class="sourceLineNo">187</span>  }<a name="line.187"></a>
<span class="sourceLineNo">188</span>}<a name="line.188"></a>




























































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